Machine for grinding heads of screw-wrenches



L. & A. G. 003s. MACHINE FOR GRINDING HEADS 0F WRENGHES OR OTHER ARTICLES.

BIO-31,075. I Patented Jan.8,1-86 1. L A

faces or edges.

tinrrno s'r 'rns PATENT onrion.

LORING GOES AND AURY G. GOES; OF WORCESTER, MASSACHUSETTS.

MACHINE FOR GRINDING HEADS OF SCREW-WRENCHES.

Specification of Letters Patent No. 31,075, dated January 8, 1861.

To all whom it may concern:

Be it known that we, LORING Cons and AURY Gr. Cons, of Worcester, in the county of Worcester and State of Massachusetts, hay e invented certain new and useful Improvements in Machines for Grinding the Heads of Screwrenches and other Articles; and we do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the accompanying drawings, making a part of this specification, in which Figure 1 represents a perspective View of said grinding machine. Fig. 2 represents a longitudinal vertical section through the same. Fig. 3, represents a perspective View of a holder for grinding parallel or beveled Fig. 4 represents a longitudinal central section through the same. Fig. 5 represents a .holder for grinding articles of different forms. Fig. 6 represents a longitudinal central section through the holder represented by Fig. 5. Figs. 7, 8, 9, 10 and 11 represent detached parts which hereafter will be more particularly referred to.

Our invention relates to the construction of holders to which the articles to be ground are secured and by which we are enabled to grind straight as well as curved faces or edges and also to adjust the'position of said articles while they are secured to the holders so as to grind the faces thereon at different angles.

It also relates to the manner of hinging said holders to an adjustable lever by means of universal joints for the purpose of enabling the operator to secure the article to be ground with facility to said holderas well as to compensate for the wearing down of the grinding stone, while this connection also permits of the free reciprocating motion of the holder which is necessary for grinding a straightface to an article.

To enable others skilled in the art to make and use our invention we will proceed to describe its construction and operation.

A represents the frame of the machine on which the grind stone B is mounted. The hanger C is suspended from the brace D, of the frame A, and can be moved thereon horizontally and secured in any desired position by means of the set screw E, for the purpose of adjusting the position of the fulcrum pin a, of the lever F, which former is pivoted in the hanger, C; The holder to which the article to be ground is secured, is pivoted to the front end of the lever, F, by the rod, G, which is hung to the pin, 6, this pin being longer than the cross head, G, of the rod, G, the latter can be moved laterally so as to change the position of the articles to be ground on the grinding surface of the stone, for the purpose of keeping a true surface on the stone while it is being worn down by use.

The holder H, is secured to the rod, G, by means of a swivel oint, its lower end passing through the hub, I, and being secured thereto by the screw, cl, Fig. 2, and the nut, c, which prevent any longitudinal motion but permit the holder to turn on said rod and which oint in connection with the pivot joint at, b, above described constitutes a universal joint which admits of any motion being given to the holder H.

The free end of the lever F, is operated by a cam, K, which acts against the-adjustable stud, f, said cam being secured to the shaft L which is connected with the driving gear of the machine. The shape of the cam, K, is such as to impart to the lever, F, holder, H, and consequently to the article to be ground a vertical reciprocating motion of a uniform speed thereby exposing each part of the face to be ground, during an equal space of time, to the action of the grindstone. As we use different holders for grinding dificrent articles, we will now describe a holder for grinding the heads of screw wrenches one of which is represented in perspective in Fig. 1, and in a vertical central section in Fig. 2.

hen the tops of the heads of the screw wrenches are to be ground, one two or more are secured to a swinging plate L by means of a clamp, h, and screw g, in the position indicated in red lines in Figs. 1 and 2 this plate is pivoted at, is, to the side pieces, M, of the holder H, and can freely play on said pivots. A rod or bar, N, is pivot-ed at, m, to the plate L, and the upper end of said rod has a hub, n, with a female screw cut in it, through which passes the sleeve hand screw, 0, which in its turn works on the screw of the screw shaft G, and thus by operating the hand screw, O, the plate L is adjusted to an inclined or,horizontal position as may be desired. To grind the tops of the wrench heads the plate,L, is adjusted to a horizontal I position as represented in red in the drawing in contact with one set of these set ings, said heads projecting back of the holder bear or are borne against the grindstone; the horizontal arms, P, of the holder rest against the posts, Q, of the carriage, R, which carriage is moved on its ways, 0, by means of the screw, 7), which is operated by the crank, and thus by operating the latter the wrench heads are held against the grind stone under the desired pressure, and as the grinding stone revolves, each part of the exposed face is acted upon during an equal length of time by the action of the cam K, on the lever F and holder H. Vhen the face thus exposed has been ground sutliciently, the hand screw, 0, is operated so as to move downward causing the rod, N, to turn the plate L, into the inclined position represented in dotted lines in Fig. 2, and the wrenches to the position represented in blue lines, and in this position the bevel is ground on the head of the wrench.

To facilitate the operation of adjusting the hinged plate, L, we employ set screws, 1, and, 8, above and below said plate by which the motion of the plate, L, in one or the other direction is stopped and when these screws are once properly adjusted the operator when he desires to change the position of the wrench has only. to turn the hand screw until it 1s stopped by the plate L comscrews; As the stone wears down the lever, F, can be moved to the rear by inserting the fulcrum pin a, into one of the holes, 1, 2, 3 &c. and the position of the stud, f, can also be adjusted accordingly. To grind the sides, the points of the jaws, and the hammer faces, of the heads we employ a holder which working on the same principle as the one above described is somewhat different in its construction. It is represented in Fig. 5. It consists mainly of a plate S, having suitable ledges S, on which are placed the wrenches represented in red, and to which they are secured by means of a clamp, T, which is drawn down on said wrenches by turning the thumb screw, 41, the tops of said wrench heads resting against the flange, 5. hen this holder is to be used it is secured to the rod, G, in a similar manner as the holder, H, but having no arms to rest against the posts, Q, the bar, U, represented in Fig. 11, is inserted between said posts and is secured in said position by means of screws which are passed through the holes, (3, and which enter the countersinks 7, of said bar.

To the back of the plate S, is secured a plate, 8, which bears against the bar, U, in grinding and as the plate, S, is moved up and down it follows that the shape of the plate, 8, will serve as the pattern to which the face exposed to the grind stone will be ground, and plates as represented in Figs. 7, 8, 9, may be substituted for the plate, 8, to grind concavo, convex, or inclined faces.

To grind knives or other articles with one beveled edge such as planlng kmves, we employ the holder represented in Figs. 3 and 4. It consists of a plate, V, to the back of which the guide piece, 10, is secured; on its works on the screw shaft G.

02, represents two springs which are secured to the back of the plate, V, they are intended to hold and press the knife to be ground against the face of the movable piece X, said knife being slipped in between said plate and the springs, and being sup- )orted by the projection, against which it bears while the grind stone works downward against it. YVhen this holder is to be used the cross head of the shaft G, is hung to the pivot, b, and the knife 2, to be ground is inserted in its proper place for grinding the face of the plate when this is properly ground the thumb screw, Z, is turned so as to move downward, causing the plate X to move in the arc of a circle and thus turning said plate to be ground until the beveled edge, 12, has arrived at its proper position forgrinding, when the grinding will proceed or take place as above described. 7e also employ in this holder set screws, for arresting the motion of the hand screw Z, and of the movable plate, to facilitate the operation of adjusting, these screws being represented at, 13, and 1 1; and to prevent the side motions of this holder we use the bar, A, represented in Fig. 10, instead of the bar, U, it having a recess, 15, of the width of the guide plate, 10, into which the latter fits and which prevents all lateral motion.

Having thus fully described the nature of our invention what we claim as new and desire to secure by Letters Patent is- 1. In combination with grinding and polishing machines a holder to which the articles to be ground are secured, said holder being so constructed and arranged as that the position of the articles may be changed while in said holder, for the purpose of grinding or polishing square or beveled faces, substantially in the manner herein described.

2. Connecting the holder to which the article to be ground is secured to the lever, F, by means of a universal joint substantially in the manner and for the purpose herein described.

3. In combination with a holder suspended to a universal joint, as herein described the adjustable lever F, for the purautomatically grinding or polishing plates 10 pose of adapting the machine to the Wear of to different patterns substantially as in the the grind stones or to stones of different dimanner herein described.

Inensions, substantially in the manner herein LORING GOES described, G i 4. In combination With a grinding and polishing machine and With a holder as WVitnesses: above described the pattern plates Figs. 7, THos. KINNIGUTT, 8, 9 or other equivalents for the purpose of J. HENRY HILL. 

